How should I handle someone who keeps disappearing and reappearing?

I’ve been talking to a guy who tends to disappear for days, then comes back casually like nothing happened. When we talk, it’s friendly but pretty surface-level (good mornings, small talk), and there’s no real follow-through or plans.

I don’t chase, but I do reply when he reaches out. I’m starting to notice a pattern where he engages when it’s convenient, then fades again.

I’m trying to figure out the best way to handle this kind of dynamic. Should I continue replying casually, match his level of effort, or step back entirely?

Would appreciate practical advice on how to deal with this without overreacting or investing too much.